"Loco" is the lead Spanish single and overall second single from Enrique Iglesias's album, Sex and Love, featuring American singer Romeo Santos. This is Iglesias' second bachata song after "Cuando Me Enamoro". A banda version of the song was recorded which features Mexican singer Roberto Tapia. Another version of the song featuring Spanish singer India Martínez was released on iTunes on 17 December 2013. At the Latin Grammy Awards of 2014, the song received a nomination for Best Tropical Song.